You open a command prompt / terminal window on a Windows, Mac OS X or Linux computer where you enter and execute the commands. There is no other place on any computer where you can enter system commands... The syntax is everywhere the same for the nslookup command.

"our business network needs to be secure"

So you're using Cisco Umbrella? Because Cisco OpenDNS Home is licensed for home/household use only. No worries, the diagnostics are good also for Umbrella.

I just tried entering the same two commands that bunibrat07 did, and it is returning the correct IP for xhamster.com. It is not being blocked. I have just enabled this feature on my laptop a few minutes ago. Do I need to reboot for the changes to take effect? I have tried this in Microsoft Edge (both normal and "in private" modes) and Google Chrome. Same results in all three. Here are the responses from the two commands -

Okay, I think I figured out what was wrong. I had to add a network on the OpenDNS site for my home network. After doing that, the two nslookup commands now return the correct results, and the xhamster.com domain is getting blocked. Thanks!

If you now want to use OpenDNS Home, you should disable LPC, because these two services are incompatible. Also, it seems you have IPv6 connectivity. I'm not sure if this has influence and also IPv6 resolver addresses need to be configured, ::ffff:d043:dedc and ::ffff:d043:dcde.

Okay, I didn't realize I needed to disable LPC. I have done that and I have also followed the instructions on your website for configuring OpenDNS filtering. I entered the first two of three IP addresses you give into the two DNS server slots in the router configuration of my NETGEAR Nighthawk X6. I then clicked the test link on your webpage and it indicated that I had things configured correctly and was now protected by OpenDNS. I tried a few domains as well to verify, and they were blocked with the exception of xhamster. That domain is still getting through. In your reply you mentioned that "IPv6 resolver addresses need to be configured." But you don't mention where or how. Is that the piece I'm missing? I get slightly different results now when I enter the two nslookup commands mentioned earlier in this thread:

"I have also followed the instructions on your website for configuring OpenDNS filtering."

Hardly. I do not have such instructions on my websites. I'm just a user, not OpenDNS staff member.

And yes, you still can reach xhamster.com over IPv6, but not over IPv4. Try with configuring the IPv6 resolver addresses I listed above in the IPv6 settings of your computer or your router. (No idea where you configured OpenDNS for IPv4. You said on your laptop, so configure on the same device for IPv6 too.) According to your router's user manual this could be doable also on the router, depending on the type of IPv6 connection you have. If you don't need to access the IPv6 internet, you also may be able to disable IPv6 connectivity altogether.

Alternatively, get rid of OpenDNS Home, but use LPC instead. You can perform the same filtering there, but you do not have stats and logs with LPC.

I fixed my issue by configuring my router to do IPv6 pass through. According to the user guide, "In pass-through mode, the router works as a Layer 2 Ethernet switch with two ports (LAN and WAN Ethernet ports) for IPv6 packets. The router does not process any IPv6 header packets." That seemed to do the trick. Now when I enter the two nslookup commands you mentioned earlier, I get the following. Thanks for your help!